Vertical Drainage of an Unsaturated Soil

by Irwin Remson,
Ronald L. Drake,
Samuel S. McNeary,
Edward M. Wallo,

Serial Information: Journal of the Hydraulics Division, 1965, Vol. 91, Issue 1, Pg. 55-74

Document Type: Journal Paper


The general equation describing vertical unsaturated flow of soil water is solved by numerical approximation for several cases. The computer programs are described. The results show: (1) The intermediate belt of a well-drained unsaturated soil approximates field capacity during times of small evapotranspiration and intermittent penetrating rainfall; (2) infiltrated rainfall moves as a pulse with a steep wetting front; (3) the belt of soil water drains from saturation to approximately field capacity within two days for zero evapotranspiration.

Subject Headings: Soil water | Saturated soils | Unsaturated soils | Penetration tests | Drainage | Evapotranspiration | Rain water | Unsaturated flow

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